Sanjay Patel 0f29e953b7 [InstCombine] canonicalize fneg with llvm.sin ...

This is a follow-up to rL339604 which did the same transform
for a sin libcall. The handling of intrinsics vs. libcalls
is unfortunately scattered, so I'm just adding this next to
the existing transform for llvm.cos for now.

This should resolve PR38458:
https://bugs.llvm.org/show_bug.cgi?id=38458
If the call was already negated, the negates will cancel
each other out.

llvm-svn: 340952

2018-08-29 18:27:49 +00:00

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